Language set does not apply to livedisk gdm
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Issue/Bug Description The language in gdm of a persistent install medium (the drive running the installation) should change to the one selected when installing to a different disk.
Steps to reproduce (if you know)
In a distinst install script add or change -l "en_US.UTF-8" to something else (ie. -l "es_ES.UTF-8")
Boot the newly installed disk
See that the language is now in the newly set language :+1:
Reboot into the persistent install medium
See that the login screen is not in the newly set language. :-1:
Expected behavior Login screen is in the installed language.
Other Notes This issue is kindof like the opposite of #68 in terms of what works and what doesn't (when both should work).